Anata no Koe ga Iroaseyou Tomo, Meiyaku no Uta ga Sono mune ni Todokimasu you ni (Even if Your Voice Fades, This Song of Oath Shall Reach You) is one of Sebastian's character songs in season 1. It's sung by Daisuke Ono, Sebastian's voice actor (sub). It fits in Kuroshitsuji Sound Complete Black Box.
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Kuroshitsuji/ Black Butler songs
General FictionHere are (probably) all Kuroshitsuji/ Black Butler openings, endings, character songs, OSTs and CDs. There will also be the character songs that are made as a headcanon by most of the fandom. Btw, sorry if there are English grammar/ spelling mistak...